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I keep hearing about U factors of .32, .35, .20, .15 and how they will save me all this money.
What I would like to know, is my current windows have a .38 U factor, and my wife and I are considering replacing them with new windows. If we were to go to a .32 U factor and all other factors staying the same. What could I expect to save per year? Most of my windows are 32 X 69.
Is there enough saving to warrant the expense.
Based on the Energy Star maps I live in the northern region. We heat with natural gas, and use window air conditioners in the summer. We have just had the rest of the house insulated with blown in insulation.